package com.lin.servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

//自动跳转
public class Refresh extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public Refresh() {
		super();
	}

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		//全局上下文ServletContext（一个web应用当中）
		ServletContext content=this.getServletContext();
		String clazz=content.getInitParameter("clazz");
		System.out.println(clazz);
		
		//ServletContext添加全局变量
		content.setAttribute("name", "apple");
		
		response.setHeader("Refresh", "5;url=http://www.baidu.com");
		response.setContentType("text/html;charset=utf-8");
		PrintWriter out=response.getWriter();
		out.println("网站地址已经更改为http://www.baidu.com，5秒自动跳转！");
	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		
	}

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occurs
	 */
	public void init() throws ServletException {
		// Put your code here
	}

}
